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Finding the Fourth Proportional to 1,297.29, 1,790.73 and 855.39

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Solution

The fourth proportional to 1,297.29, 1,790.73 and 855.39 is: 1,180.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.29 : 1,790.73 = 855.39 : x
  2. Step 2: Convert to fraction form
    1,297.29/1,790.73 = 855.39/x
  3. Step 3: Cross multiply
    1,297.29x = 1,790.73 × 855.39
  4. Step 4: Simplify right side
    1,297.29x = 1,531,772.53
  5. Step 5: Solve for x
    x = 1,531,772.53/1,297.29
  6. Step 6: Final answer
    x = 1,180.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.